1 #ifndef __EXTENTIO__ 2 #define __EXTENTIO__ 3 4 #include <linux/rbtree.h> 5 6 /* bits for the extent state */ 7 #define EXTENT_DIRTY 1 8 #define EXTENT_WRITEBACK (1 << 1) 9 #define EXTENT_UPTODATE (1 << 2) 10 #define EXTENT_LOCKED (1 << 3) 11 #define EXTENT_NEW (1 << 4) 12 #define EXTENT_DELALLOC (1 << 5) 13 #define EXTENT_DEFRAG (1 << 6) 14 #define EXTENT_DEFRAG_DONE (1 << 7) 15 #define EXTENT_BUFFER_FILLED (1 << 8) 16 #define EXTENT_BOUNDARY (1 << 9) 17 #define EXTENT_NODATASUM (1 << 10) 18 #define EXTENT_DO_ACCOUNTING (1 << 11) 19 #define EXTENT_FIRST_DELALLOC (1 << 12) 20 #define EXTENT_IOBITS (EXTENT_LOCKED | EXTENT_WRITEBACK) 21 #define EXTENT_CTLBITS (EXTENT_DO_ACCOUNTING | EXTENT_FIRST_DELALLOC) 22 23 /* 24 * flags for bio submission. The high bits indicate the compression 25 * type for this bio 26 */ 27 #define EXTENT_BIO_COMPRESSED 1 28 #define EXTENT_BIO_FLAG_SHIFT 16 29 30 /* these are bit numbers for test/set bit */ 31 #define EXTENT_BUFFER_UPTODATE 0 32 #define EXTENT_BUFFER_BLOCKING 1 33 #define EXTENT_BUFFER_DIRTY 2 34 #define EXTENT_BUFFER_CORRUPT 3 35 36 /* these are flags for extent_clear_unlock_delalloc */ 37 #define EXTENT_CLEAR_UNLOCK_PAGE 0x1 38 #define EXTENT_CLEAR_UNLOCK 0x2 39 #define EXTENT_CLEAR_DELALLOC 0x4 40 #define EXTENT_CLEAR_DIRTY 0x8 41 #define EXTENT_SET_WRITEBACK 0x10 42 #define EXTENT_END_WRITEBACK 0x20 43 #define EXTENT_SET_PRIVATE2 0x40 44 #define EXTENT_CLEAR_ACCOUNTING 0x80 45 46 /* 47 * page->private values. Every page that is controlled by the extent 48 * map has page->private set to one. 49 */ 50 #define EXTENT_PAGE_PRIVATE 1 51 #define EXTENT_PAGE_PRIVATE_FIRST_PAGE 3 52 53 struct extent_state; 54 55 typedef int (extent_submit_bio_hook_t)(struct inode *inode, int rw, 56 struct bio *bio, int mirror_num, 57 unsigned long bio_flags, u64 bio_offset); 58 struct extent_io_ops { 59 int (*fill_delalloc)(struct inode *inode, struct page *locked_page, 60 u64 start, u64 end, int *page_started, 61 unsigned long *nr_written); 62 int (*writepage_start_hook)(struct page *page, u64 start, u64 end); 63 int (*writepage_io_hook)(struct page *page, u64 start, u64 end); 64 extent_submit_bio_hook_t *submit_bio_hook; 65 int (*merge_bio_hook)(struct page *page, unsigned long offset, 66 size_t size, struct bio *bio, 67 unsigned long bio_flags); 68 int (*readpage_io_hook)(struct page *page, u64 start, u64 end); 69 int (*readpage_io_failed_hook)(struct bio *bio, struct page *page, 70 u64 start, u64 end, 71 struct extent_state *state); 72 int (*writepage_io_failed_hook)(struct bio *bio, struct page *page, 73 u64 start, u64 end, 74 struct extent_state *state); 75 int (*readpage_end_io_hook)(struct page *page, u64 start, u64 end, 76 struct extent_state *state); 77 int (*writepage_end_io_hook)(struct page *page, u64 start, u64 end, 78 struct extent_state *state, int uptodate); 79 void (*set_bit_hook)(struct inode *inode, struct extent_state *state, 80 int *bits); 81 void (*clear_bit_hook)(struct inode *inode, struct extent_state *state, 82 int *bits); 83 void (*merge_extent_hook)(struct inode *inode, 84 struct extent_state *new, 85 struct extent_state *other); 86 void (*split_extent_hook)(struct inode *inode, 87 struct extent_state *orig, u64 split); 88 int (*write_cache_pages_lock_hook)(struct page *page); 89 }; 90 91 struct extent_io_tree { 92 struct rb_root state; 93 struct radix_tree_root buffer; 94 struct address_space *mapping; 95 u64 dirty_bytes; 96 spinlock_t lock; 97 spinlock_t buffer_lock; 98 struct extent_io_ops *ops; 99 }; 100 101 struct extent_state { 102 u64 start; 103 u64 end; /* inclusive */ 104 struct rb_node rb_node; 105 106 /* ADD NEW ELEMENTS AFTER THIS */ 107 struct extent_io_tree *tree; 108 wait_queue_head_t wq; 109 atomic_t refs; 110 unsigned long state; 111 112 /* for use by the FS */ 113 u64 private; 114 115 struct list_head leak_list; 116 }; 117 118 struct extent_buffer { 119 u64 start; 120 unsigned long len; 121 unsigned long map_start; 122 unsigned long map_len; 123 struct page *first_page; 124 unsigned long bflags; 125 struct list_head leak_list; 126 struct rcu_head rcu_head; 127 atomic_t refs; 128 129 /* count of read lock holders on the extent buffer */ 130 atomic_t write_locks; 131 atomic_t read_locks; 132 atomic_t blocking_writers; 133 atomic_t blocking_readers; 134 atomic_t spinning_readers; 135 atomic_t spinning_writers; 136 137 /* protects write locks */ 138 rwlock_t lock; 139 140 /* readers use lock_wq while they wait for the write 141 * lock holders to unlock 142 */ 143 wait_queue_head_t write_lock_wq; 144 145 /* writers use read_lock_wq while they wait for readers 146 * to unlock 147 */ 148 wait_queue_head_t read_lock_wq; 149 }; 150 151 static inline void extent_set_compress_type(unsigned long *bio_flags, 152 int compress_type) 153 { 154 *bio_flags |= compress_type << EXTENT_BIO_FLAG_SHIFT; 155 } 156 157 static inline int extent_compress_type(unsigned long bio_flags) 158 { 159 return bio_flags >> EXTENT_BIO_FLAG_SHIFT; 160 } 161 162 struct extent_map_tree; 163 164 typedef struct extent_map *(get_extent_t)(struct inode *inode, 165 struct page *page, 166 size_t pg_offset, 167 u64 start, u64 len, 168 int create); 169 170 void extent_io_tree_init(struct extent_io_tree *tree, 171 struct address_space *mapping); 172 int try_release_extent_mapping(struct extent_map_tree *map, 173 struct extent_io_tree *tree, struct page *page, 174 gfp_t mask); 175 int try_release_extent_buffer(struct extent_io_tree *tree, struct page *page); 176 int try_release_extent_state(struct extent_map_tree *map, 177 struct extent_io_tree *tree, struct page *page, 178 gfp_t mask); 179 int lock_extent(struct extent_io_tree *tree, u64 start, u64 end, gfp_t mask); 180 int lock_extent_bits(struct extent_io_tree *tree, u64 start, u64 end, 181 int bits, struct extent_state **cached, gfp_t mask); 182 int unlock_extent(struct extent_io_tree *tree, u64 start, u64 end, gfp_t mask); 183 int unlock_extent_cached(struct extent_io_tree *tree, u64 start, u64 end, 184 struct extent_state **cached, gfp_t mask); 185 int try_lock_extent(struct extent_io_tree *tree, u64 start, u64 end, 186 gfp_t mask); 187 int extent_read_full_page(struct extent_io_tree *tree, struct page *page, 188 get_extent_t *get_extent); 189 int __init extent_io_init(void); 190 void extent_io_exit(void); 191 192 u64 count_range_bits(struct extent_io_tree *tree, 193 u64 *start, u64 search_end, 194 u64 max_bytes, unsigned long bits, int contig); 195 196 void free_extent_state(struct extent_state *state); 197 int test_range_bit(struct extent_io_tree *tree, u64 start, u64 end, 198 int bits, int filled, struct extent_state *cached_state); 199 int clear_extent_bits(struct extent_io_tree *tree, u64 start, u64 end, 200 int bits, gfp_t mask); 201 int clear_extent_bit(struct extent_io_tree *tree, u64 start, u64 end, 202 int bits, int wake, int delete, struct extent_state **cached, 203 gfp_t mask); 204 int set_extent_bits(struct extent_io_tree *tree, u64 start, u64 end, 205 int bits, gfp_t mask); 206 int set_extent_bit(struct extent_io_tree *tree, u64 start, u64 end, 207 int bits, int exclusive_bits, u64 *failed_start, 208 struct extent_state **cached_state, gfp_t mask); 209 int set_extent_uptodate(struct extent_io_tree *tree, u64 start, u64 end, 210 struct extent_state **cached_state, gfp_t mask); 211 int set_extent_new(struct extent_io_tree *tree, u64 start, u64 end, 212 gfp_t mask); 213 int set_extent_dirty(struct extent_io_tree *tree, u64 start, u64 end, 214 gfp_t mask); 215 int clear_extent_dirty(struct extent_io_tree *tree, u64 start, u64 end, 216 gfp_t mask); 217 int set_extent_delalloc(struct extent_io_tree *tree, u64 start, u64 end, 218 struct extent_state **cached_state, gfp_t mask); 219 int find_first_extent_bit(struct extent_io_tree *tree, u64 start, 220 u64 *start_ret, u64 *end_ret, int bits); 221 struct extent_state *find_first_extent_bit_state(struct extent_io_tree *tree, 222 u64 start, int bits); 223 int extent_invalidatepage(struct extent_io_tree *tree, 224 struct page *page, unsigned long offset); 225 int extent_write_full_page(struct extent_io_tree *tree, struct page *page, 226 get_extent_t *get_extent, 227 struct writeback_control *wbc); 228 int extent_write_locked_range(struct extent_io_tree *tree, struct inode *inode, 229 u64 start, u64 end, get_extent_t *get_extent, 230 int mode); 231 int extent_writepages(struct extent_io_tree *tree, 232 struct address_space *mapping, 233 get_extent_t *get_extent, 234 struct writeback_control *wbc); 235 int extent_readpages(struct extent_io_tree *tree, 236 struct address_space *mapping, 237 struct list_head *pages, unsigned nr_pages, 238 get_extent_t get_extent); 239 int extent_fiemap(struct inode *inode, struct fiemap_extent_info *fieinfo, 240 __u64 start, __u64 len, get_extent_t *get_extent); 241 int set_state_private(struct extent_io_tree *tree, u64 start, u64 private); 242 int get_state_private(struct extent_io_tree *tree, u64 start, u64 *private); 243 void set_page_extent_mapped(struct page *page); 244 245 struct extent_buffer *alloc_extent_buffer(struct extent_io_tree *tree, 246 u64 start, unsigned long len, 247 struct page *page0); 248 struct extent_buffer *find_extent_buffer(struct extent_io_tree *tree, 249 u64 start, unsigned long len); 250 void free_extent_buffer(struct extent_buffer *eb); 251 int read_extent_buffer_pages(struct extent_io_tree *tree, 252 struct extent_buffer *eb, u64 start, int wait, 253 get_extent_t *get_extent, int mirror_num); 254 255 static inline void extent_buffer_get(struct extent_buffer *eb) 256 { 257 atomic_inc(&eb->refs); 258 } 259 260 int memcmp_extent_buffer(struct extent_buffer *eb, const void *ptrv, 261 unsigned long start, 262 unsigned long len); 263 void read_extent_buffer(struct extent_buffer *eb, void *dst, 264 unsigned long start, 265 unsigned long len); 266 void write_extent_buffer(struct extent_buffer *eb, const void *src, 267 unsigned long start, unsigned long len); 268 void copy_extent_buffer(struct extent_buffer *dst, struct extent_buffer *src, 269 unsigned long dst_offset, unsigned long src_offset, 270 unsigned long len); 271 void memcpy_extent_buffer(struct extent_buffer *dst, unsigned long dst_offset, 272 unsigned long src_offset, unsigned long len); 273 void memmove_extent_buffer(struct extent_buffer *dst, unsigned long dst_offset, 274 unsigned long src_offset, unsigned long len); 275 void memset_extent_buffer(struct extent_buffer *eb, char c, 276 unsigned long start, unsigned long len); 277 int wait_extent_bit(struct extent_io_tree *tree, u64 start, u64 end, int bits); 278 int clear_extent_buffer_dirty(struct extent_io_tree *tree, 279 struct extent_buffer *eb); 280 int set_extent_buffer_dirty(struct extent_io_tree *tree, 281 struct extent_buffer *eb); 282 int set_extent_buffer_uptodate(struct extent_io_tree *tree, 283 struct extent_buffer *eb); 284 int clear_extent_buffer_uptodate(struct extent_io_tree *tree, 285 struct extent_buffer *eb, 286 struct extent_state **cached_state); 287 int extent_buffer_uptodate(struct extent_io_tree *tree, 288 struct extent_buffer *eb, 289 struct extent_state *cached_state); 290 int map_private_extent_buffer(struct extent_buffer *eb, unsigned long offset, 291 unsigned long min_len, char **map, 292 unsigned long *map_start, 293 unsigned long *map_len); 294 int extent_range_uptodate(struct extent_io_tree *tree, 295 u64 start, u64 end); 296 int extent_clear_unlock_delalloc(struct inode *inode, 297 struct extent_io_tree *tree, 298 u64 start, u64 end, struct page *locked_page, 299 unsigned long op); 300 struct bio * 301 btrfs_bio_alloc(struct block_device *bdev, u64 first_sector, int nr_vecs, 302 gfp_t gfp_flags); 303 #endif 304